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Yeah ill agree with that...its just the wideband was 300 and I was told thats used more for guys running boost which I don't have(yet)....there's really nothing else I can check or change to make sense of all of this but then again ive always got crappy mileage even before all my mods but no CEL ...I'm guessing the more aggressive tune just made the problem more visible for the ecu?..these are all "maybes" and "ifs" Ofcourse..going out on a limb if u will

So this thread doesnt get derailed any further, my advice to you would be to remove both the vacuum leak device and the PEM. Run the stock chip and diagnose from there. There is something significantly wrong with your motor. Remove the questionable variables and go from there.

I haven't posted in a liit, but keep giong back and forth through PM's with some of the guys in the thread.

I've also still got the p0172 code ('98 wolfie 5spd) on the car with the chip installed. I also get the same idle issues, I did adjust my idle down from the ~1050-1100 the chip came set with (did that this weekend). I have it set at ~925, and in order to adjust it I had to modify channel 01, but the others did not cause a change in idle speed. (channels 02-05)

I've replaced all the vacuum lines I could find over a period of time, tried 2 different purge valves as well. I'm sure there is more that I've done, but can't think of it all off the top of my head. I've been trying to figure this one out for a very long time now. (I had another thread)

The car is not as strong as it was when I first put the chip in, I think the full power lasted roughly 1 week after putting the chip in at H2Oi 2010. The idle and weird hesitation got on my nerves at one point that I just went back to stock for quite a while. I've had the chip in for months now, and the full power isn't there that once was. The car doesn't run bad or anything like that, it runs like say stock power or about that, but VERY noticeably lower from the first day I put the chip in. Always running 92-93oct as well.

@ Travis,

If you want I can do some logging or supply whatever vagcom data you want if that'll help solve this for us all.

Kei

(I'm also MORE than willing to be a guinea pig for a new flash as well)

EDIT: I forgot to mention that I also get that random stalling at idle too sometimes (it's been a while though), but it will act like it's about to cut out at the strangest times randomly...actually that part happened again today

Last edited by Kiyokix; 10-05-2011 at 05:47 PM.

Originally Posted by VWestlife

If you pace the cars around you, I bet you'll find that people rarely accelerate to 60 MPH in any quicker than 20 seconds.

I had the exact same issue with my C2 chip and bbm supercharger setup, I just always figured it was because of the s/c and the position of the throttle body. When I put the throttle body on the intake it would stop doing it. It was exactly how you guys describe it though, random idle hanging/raising between 1-2k rpms when coming to a stop. Never had that problem with early non-c2 chips but they also ran like crap and stalled out constantly, the c2 chip was such a drastic improvement that I never bothered to mention it.

Weird Update: Just for experimentation purposes, I ran 89 octane today and the car seemed to do actually better for some reason. Power felt like it was there and "almost" no throttle lag. It almost feels like the car has more power with 89 vs 93. Just an experimentation.

ive got a 98 jetta as well and have the same problem. ive got a 276 cam in there. the random rpms going up and down between 1500 and 2000 untill it eventually settles to 1050. also have a cel for running to rich and im also getting very crappy city mileage, yet amazing highway mileage. i know my maf is bad, kept cleaning it but the code keeps coming back, and i have a brand new vdo brand throttle body. any ideas? i noticed the crappy mileage when i went from my autotech chip to the stage 2 pem. from what i understand, the pem is like a fineley tuned machine that even the smallest kink will throw it off because it demands a lot from all the sensors readings.

So this thread doesnt get derailed any further, my advice to you would be to remove both the vacuum leak device and the PEM. Run the stock chip and diagnose from there. There is something significantly wrong with your motor. Remove the questionable variables and go from there.

i have been having all these problems that all of you are talking about (P0172,car shutting off during warm up cycle, also while driving )
the code only came up whenever the chip was installed which is weird..
anyway, i sent out my ecu and chip over to c2 motorsports so they can check out whats wrong with it.
once i get an answer from them ill post it up on the thread.. maybe its the same problem for all of us who knows....

i have been having all these problems that all of you are talking about (P0172,car shutting off during warm up cycle, also while driving )
the code only came up whenever the chip was installed which is weird..
anyway, i sent out my ecu and chip over to c2 motorsports so they can check out whats wrong with it.
once i get an answer from them ill post it up on the thread.. maybe its the same problem for all of us who knows....

i think they're all important issues----cant pass inspection with a CEL...engine shutting off is no bueno on warm up or randomly while driving even worse. the rev hang is annoying and the jumpy or bucking throttle at lower rpms is just as frustrating. hopefully we'll get to the bottom of it all soon!

Just a quick question, has anyone changed the vacuum lines under their fenders? For the evap system on the left and the vacuum reservoir on the right? I haven't yet cause I haven't taken my fenders off yet. I have changed all other ones under the hood though.